Decorated surface.



PATENT-ED JULY 21, 1903.

v A. B. PORTER.

DEGORA'TED SURFACE. AIPLICIATIOIIIl FILED HAY 22, 1903.

WHW-:1 :El

I0 MODEL.

IIIIIIl 3o surface.

No. 734,7135; f

UNITED STATES ratentea July 2i, ieo.

PATENT OFFICE.

ALEERT B. PORTER, OE EvANsTON, ILLINOIS.

DECO RATED su RFACE'.

'SPECIFICATION forming part of Letters PatentvNo. 734,135, dated 3111?/21, 1903- Application iiled May 22, 1903. Serial No. 158,339. (Nomodela) 5 nois, have invented certain new and useful Improvements inDecorated Surfaces, of

Which the following is a specification. This 4invention relates moreparticularly to the decorating of glass, metal, and otherware io withdiffraction grating-surfacesfor the purpose of producing colored-lighteffects. It is already Well understood that a surface provided with asingle grating or one consisting of a single set of parallel lines willproduce a brilliant display of spectrum colors, and in my companionapplication, Serial No. 112,780, filed June 23, 1902, I have pointed'outthat if the grating consists of a plurality of sets of parallel linescrossing each other angularly,

zo so as to diffract the light-rays in' different directions, it Willproduce a highly-colored rainbow appearance, no matter fromwhatdirection the surface is viewed. I have also discovered that asomewhat-different but still z 5 highly-decorative effect may beproduced by providing the surface with rulings which differ in directionin adjacent portions, so that the light is diffracted dierently to theeye from these diiferent portions of the decorated In the simplestapplication Of my improvement in this respect single parallel rulingsdiffering in direction will be placed in spots over the surface to bedecorated.

More highly developed, the invention contemplates rulings differing indirection in adjacent portions of the decorated surface ac-l cording toa predetermined arrangement by which the light dilfracted by the rulingswill produce on the eye the effect of a distinct 4o pattern or figure,and in this case the rulings, may consist of either single or crossedsets of-v lines.

The object of the invention isto provide improved decorative eects forglass, metal,

and other Ware along the lines above indigo shows how the surface may bedecorated by Single parallelrulings arranged at different angles indiiferent portions of the decorated appear differently to the eye.

surface. Fig. 2 shows a pattern effect pro'- duced in a similar mannerby varying the directions of the rulings according to some predetermineddesign.' Fig. 3 shows a pattern decoration produced by crossed sets oflines.

As shown in Fig. I, single diractiOn-rulings a, cousis'tingofclosely-adjacent parallel lines, usually several thousand to the inch,are applied in spots all over the decorated surface A, which may be thatof glass, metal, pottery, or other material and may be either a dat orcurved surface'. The rulings of the several spots dier from each otherin direction, and as a consequence the lightfrom each source will bedifferentlydiffracted from the different portions of the surface and'each portion will Thus some of the spots Will show a more brilliantdisplay of spectrum colors than others,and some of the spots are liablenot to show any color at all, for the reason that the singlediractionrulings will only diifract the light from each source in asingle direction, which may not be in a direction to meet the eye. As aWhole, however, the surface Will appear brilliantly decorated in colorswhich will vary in appearance and effect with every movement either ofthe light, the surface, or the point of View.

In Fig. 2 a distinct pattern effect is shown as produced by applying thedierent rulings after a predetermined arrangement, which in thisinstance consists of arranging the rulings in-rows and making thedirections of the ruliings the same in every other spot of each row.

In Fig. San effect similar to that of Fig. 2 is produ`cedfby crossedinstead Of single parallel diffraction-rulings. Where crossedr rulingsare provided, the number of different directions of ruling employed inthe several spots of the surface need not be so great to produce anequally varied effect as where single rulings alone are employed.

It will be understood that the term rulings as used herein is intendedto be generic to diffraction grating-surfaces consisting of closelyadjacent parallel lines, straight or curved, without regard to themanner in which said lines may be applied to the surface, whethermechanically,photographically, or otherwise. Most conveniently suchrulings Will be applied photographically, and in case a patterneffectsuch as that shown in Figs. 2 and 3 is desired it may be produced byusing a previously-ruled printing-plate and rotating the same throughthe requisite angle bet-Ween the printings of the adjacent spots, whichprinting will be done or the light for it admitted through an opaquescreen having an openinplr of the form of the desired spots. As shown inFigs. 2 and 3, this opening is assumed to have been a square; but itwill be obvious that other shapes of opening may be employed and thatthe pattern effect given the decorated surface may be variedindefinitely by changes inthe screen-opening or differing manipulationsof the printingplate.

I claim as my invention-'- 1. As a new article of manufacture, glass,pottery, and metal ware, having;r its surface decorated in separateportions with sets of closely-adjacent parallel lines forming dif-ALBERT B. PORTER.

\Vitnesses:

HENRY W. CARTER, K. A. COSTELLO.

